Water pollution can come from many sources. Point-source pollution comes from large farms, factories, septic systems, sanitation systems, and landfills. Nonpoint pollution sources include cities, abandoned mining sites, and animal waste.
Greenhouse gases absorb energy from the sun. The gases hold onto this heat and trap it in the atmosphere instead of allowing it to be reflected into space. The increased temperature from the gases in the atmosphere is a major factor in climate change.
Greenhouse gases arise naturally, and are part of the make-up of our atmosphere. Earths conditions are just right to allow life, including us, to flourish. Part of what makes Earth so amenable is the naturally-arising greenhouse effect, which keeps the planet at a friendly 15 °C (59 °F) on average. But in the last century or so, humans have been interfering with the energy balance of the planet, mainly through the burning of fossil fuels that give off additional carbon dioxide into the air. The level of carbon dioxide in Earth’s atmosphere has been rising consistently for decades and traps extra heat near the surface of the Earth, causing temperatures to rise.
Innate immunity is a kind of immune response that is existing in our human body which is automatic and non- specific.
These defenses start to fight off pathogens before they start the effective action.
Innate immunity appears into action immediately when an antigen's presence is detected in the body.
It includes physical barriers like skin, chemical compounds in the blood and immune system cells like epithelial cells, that attack the foreign cells in our human body.
